DOI: 10.1016/j.epsl.2018.03.005
Scopus记录号: 2-s2.0-85044928241
论文题名: Role of pre-existing structures in controlling the Cenozoic tectonic evolution of the eastern Tibetan plateau: New insights from analogue experiments
作者: Sun M. ; Yin A. ; Yan D. ; Ren H. ; Mu H. ; Zhu L. ; Qiu L.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 491 起始页码: 207
结束页码: 215
语种: 英语
英文关键词: analogue modeling
; India–Asia collision
; Longmen Shan thrust belt
; Songpan–Ganzi terrane
; Tibetan plateau
; Xianshuihe fault
Scopus关键词: Buildings
; Deformation
; Faulting
; Kinematics
; Lithology
; Analogue modeling
; Continental deformation
; Continental lithosphere
; Eastern Tibetan plateau
; Instantaneous response
; Thrust belts
; Tibetan Plateau
; Xianshuihe fault
; Geodynamics
; Cenozoic
; continental collision
; experimental study
; modeling
; tectonic evolution
; terrane
; thrust
; China
; Longmen Mountains
; Qinghai-Xizang Plateau
; Sichuan
; Songpan-Ganzi Fold Belt
; Xianshuihe Fault Zone
英文摘要: Pre-existing weakness due to repeated tectonic, metamorphic, and magmatic events is a fundamental feature of the continental lithosphere on Earth. Because of this, continental deformation results from a combined effect of boundary conditions imposed by plate tectonic processes and heterogeneous and anisotropic mechanical strength inherited from protracted continental evolution. In this study, we assess how this interaction may have controlled the Cenozoic evolution of the eastern Tibetan plateau during the India–Asia collision. Specifically, we use analogue models to evaluate how the pre-Cenozoic structures may have controlled the location, orientation, and kinematics of the northwest-striking Xianshuihe and northeast-striking Longmen Shan fault zones, the two most dominant Cenozoic structures in eastern Tibet. Our best model indicates that the correct location, trend, and kinematics of the two fault systems can only be generated and maintained if the following conditions are met: (1) the northern part of the Songpan–Ganzi terrane in eastern Tibet has a strong basement whereas its southern part has a weak basement, (2) the northern strong basement consists of two pieces bounded by a crustal-scale weak zone that is expressed by the Triassic development of a northwest-trending antiform exposing middle and lower crustal rocks, and (3) the region was under persistent northeast–southwest compression since ∼35 Ma. Our model makes correct prediction on the sequence of deformation in eastern Tibet; the Longmen Shan right-slip transpressional zone was initiated first as an instantaneous response to the northeast–southwest compression, which is followed by the formation of the Xianshuihe fault about a half way after the exertion of northeast–southwest shortening in the model. The success of our model highlights the importance of pre-existing weakness, a key factor that has been largely neglected in the current geodynamic models of continental deformation. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109923
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: School of Earth Sciences and Resources, China University of Geosciences, Beijing, 100083, China; Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, CA 90095-1567, United States; 7th Gold Exploration Team of the Chinese Armed Police Force, Yantai, 264004, China
Recommended Citation:
Sun M.,Yin A.,Yan D.,et al. Role of pre-existing structures in controlling the Cenozoic tectonic evolution of the eastern Tibetan plateau: New insights from analogue experiments[J]. Earth and Planetary Science Letters,2018-01-01,491